Great picture...except....that guitar is a Mosrite, but someone has attached an Ovation headstock to the Mosrite neck.

head.jpg (35.19 KiB) Viewed 527 times

Here is the original photo from the photo session (you can see that it was cropped with a little bit of the Mosrite truss rod cover showing):

GlenCampbell_Selections[1]-29.jpg (12.89 KiB) Viewed 527 times

All I can think of is that they wanted Glen to have a full guitar in that picture, and thought that model of guitar was an Ovation and photoshopped the Ovation head on it. You can fool some of the people....